A built-in prestressed wooden beam

Abstract

The invention discloses a concealed prestressed wood beam, which comprises a wood beam, one or more prestressed tendons, steering devices and anchoring devices, wherein the wood beam is a coupled beam, and cushion blocks between beams, a cushion block at an anchoring end, and bolts are arranged between two parallel beams which are connected to form a whole body; the one or more prestressed tendons are arranged in a middle gap of the coupled beam, and the two ends of the prestressed tendons are anchored at the beam end, on a column body or between the beams by the anchoring device; the middle part of each prestressed tendon is fixedly arranged in the middle of the coupled beam by the corresponding steering device, and each steering device comprises a pin shaft and a gluing steel plate; each gluing steel plate is fixedly arranged in a wood beam body or adhered to the inner side of the wood beam by adhesive resin, and each pin shaft passes through a pin shaft hole in the corresponding gluing steel plate and is transversely arranged in the middle gap of the coupled beam. The concealed prestressed wood beam provided by the invention has the advantages of high bearing capacity, light self weight, good fireproof performance, simple system, attractive appearance, industrial production, and quick installation. The concealed prestressed wood beam provided by the invention can be used in the fields of structures such as large-span buildings and bridges.

Description

technical field [0001] The invention relates to a built-in prestressed wooden beam, which is mainly (but not exclusively) used in the fields of building structures, roofs, bridge superstructures and the like. Background technique [0002] Generally, the glulam beam shows brittle tensile failure when it is bent, and the timber on the compression side cannot be fully utilized. At home and abroad, steel bars or FRP (Fiber Reinforced Polymer) materials are used to strengthen glued wood beams, and the effect is obvious. However, whether reinforced or not, the load-bearing capacity of glulam beams is usually controlled by deformation, and its strength cannot be fully utilized. In order to solve the problem of large deformation and further improve the structural performance of glulam beams, applying prestress to the reinforcing material is one of the feasible measures. [0003] External prestressing is one of the important branches of the post-tensioning prestressing system. It r...

AI Technical Summary

Problems solved by technology

However, the disadvantage of external prestressing is its weak fire resistance and poor structural appearance, especially the fire resistance and high temperature resistance, which must be given enough attention, because in the event of a fire, the external prestressed steel bars will quickly fail and quickly lead to Structural damage, which is also one of the restrictive factors for the popularization and application of external prestressed structures

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